Removed logging config.

This configuration is applied regardless of the value of LOGGING;
duplicating it in LOGGING is confusing.
Removed MEDIA_ROOT/URL from default settings template.

Many sites will never deal with user-uploaded files, and MEDIA_ROOT is
complicated to explain.

Thanks Carl Meyer for the suggestion.
Removed STATIC_ROOT from the default settings template.

It isn't necessary in development, and it confuses beginners to no end.

Thanks Carl Meyer for the suggestion.
Used an absolute path for the SQLite database.

This ensures the settings file works regardless of which directory
django-admin.py / manage.py is invoked from.

BASE_DIR got a +1 from a BDFL and another core dev. It doesn't involve
the concept of a "Django project"; it's just a convenient way to express
relative paths within the source code repository for non-Python files.

Thanks Jacob Kaplan-Moss for the suggestion.
Added security warnings for the most sensitive settings.
Adjusted the default URLconf detection to account for the admin.

It's now enabled by default.
Updated tutorial 1 for the new project template.
Updated tutorial 2 for the new project template.
Minor fixes in tutorials 5 and 6.
Documented the simplified app & project templates in the changelog.
Tweaked default settings file.

* Explained why BASE_DIR exists.
* Added a link to the database configuration options, and put it in its
  own section.
* Moved sensitive settings that must be changed for production at the
  top.